how to avoid conflicts in Goto and From tags when copying a block and automatically updating tag names

 I developed a subsystem block and adding it to a virtual node connector. When copying the block I want all corresponding tags to be updated with new one. I wrote this code in initialization tab of mask parameter
h=gcbh;
nn=get(h,'Name');
nnn=nn(3:end);
hQr=find_system(h,'LookUnderMasks','All','Name','From');
hQm=find_system(h,'LookUnderMasks','All','Name','Goto');
hcap=find_system(h,'LookUnderMasks','All','Name','Goto');
set(hQr,'GotoTag',['Qr',nnn]);
set(hQm,'GotoTag',['Qm',nnn]);
set(hcap,'GotoTag',['cap',nnn]);

there is one input from tag and two Goto tag but I am unable to get these tags updated in new copied block. Any suggestion??

thanks